Automatic safety check-valve.



No. 805,498. PATENTED NOV. 28, 1905. T. L.- STEWART.

AUTOMATIG SAFETY CHECK VALVE. nPLIoATIoN FILED un 22, 1905.

lllllllm 8 THOMAS LEE STEWART, OF PORTLAND, OREGON.

AUTOMATIC SAFETY CHECK-VALVE.

Specification of Letters Patent.

Patented Nov. 28, 1905.

Application filed May 22,1905. Serial No. 261,599.

To all whom it may concern:

Be it known that I, THOMAS LEE STEWART, residing at Portland, in the county of Mult- `nomah and .State of Oregon, have invented a new and Improved Automatic Safety Check- Valve, of which the followingis a specification.

This invention relates to automatic checkvalves of that type designed to stop the How ofliquids and gases when the flow thereof exceeds the maximum desired, and it seeks to provide a valve of this character of a simple and economical construction in which the parts are designed for easy adjustment and which sensitively operate and effectively serve for their intended purposes.

My invention comprehends generally a valve-chamber having an inlet, an adjustable valve for regulating the feed from the said inlet to the valve-chamber, a valve-governed outlet and a pressure-gage outlet communicating with and at a point above the valvechamber, and an automatically-acting valve whose movement is governed bythe varying ow of the liquid or gases into the valvechamber and thereagainst.

In its more subordinate features my invention comprehends certain details of construction and peculiar combination of parts, all of which will hereinafter be fully explained and specifically pointed out in the appended claims, reference being had to the accompanying drawings, iu Which- Figure l is avertical longitudinal section of my improved check-valve, the valve being shown forced up to its seat to close the outiiow through the valve-chamber. Fig. 2 is a side elevation, partly in section, lookingin the direction of the arrow on Fig. 1. Fig. 3 is a vertical section of the same with the valve adjusted to permit of a flow of the liquid or gas through the valve-chamber. Fig. 4 is a horizontal section taken practically on the line 4 4 of Fig. 1.

In carrying out my invention I provide a valve-casing of metal or glass, having a diameter l, whose upper end is provided with an external thread la, adapted to detachably receive a cap portion B,formed with apendentlythreaded iiange Z2 to engage the threads c' or otherwise suitably attached to the casing, and a cone-shaped receiving-pocket b', which terminates in a valve-seat 4 at a point just below the lateral outlet b5, which communicates with the pressure-gage. (Not shown.) Above the lateral outlet b5 is a valve-controlled outlet 5", which communicates with the o1ftalepipe a', the said valve-outlet 5X having a valveseat 5y, with which the adjustable valve 5 cooperates. The valve 5 is ad justablymounted in the extension 6 of the cap, which extension has the usual stuiing-box or gland 7, as shown. At a point just below the bottom of the valvechamber the casing has a laterally-projected threaded tubular hub 8, which communicates with a port 9, that discharges into the valvechamber l, and an inlet-port 9, that communicates with the feed-inlet 10, into which the intake-pipe CZ discharges and which in practice extends to near the bottom of the pressure-tank, (not shown,) and the inlet-port 9' has a valve-seat with which cooperates the adjustable valve C, which threads into the tubular boss 8 and which is also equipped with the usual gland or stufling-cap, as shown.

The automatically-movable valve com prises a cylindrical body F of a diameter to freely move up or down within the chamber l and provided with a central passage f', the upper end of which is enlarged and threaded to receive the screw-plug 11, which screws into the cone-shaped valve-head F, whose tapered surface is properly beveled to coact with the valve-seat 4 in the lower end of the pocket o' in the cap, and the said valve-head is of a diameter less than that of the chamber l and is provided with radial ports f2, which communicate with the central passage j in the valve-body F. By properly adjusting the screw-plug 1l the amount of iiow necessary to make the valve operate is regulated.

Briey, the operation of my invention is as follows: The liquid or gas passes through the valve in the direction of the arrows in Fig. 3 when the valve O and the valve 5 are opened, it being understood that the valvebody F is so adjusted as to remain open with a given iow, and when the {iow of gas is in excess of the maximum desired the valvebody 7 rises up until its valve-seat-engaging portion F seats on the seat 4, as shown in Fig. l, to shut off the iiow through the valve.

From the foregoing description, taken in connection with the accompanying drawings, it is believed the complete construction and operation of my invention will be readily apparent.

Under ordinary conditions when the parts are adjusted as shown in Fig. 3 the uid or gases enter and pass in the directions indicated by the arrow from the intake CZ to the otake-pipe When the flow of the gases or of the liquid exceeds a predetermined IOO IIO

maximum point, the excess flow causes the automatic check-valve to rise and its cap F to engage the valve-seat and hold it there, and thereby cut off the iiow from the chamber l to the offtake, it being understood that when the said flow or pressure is ofi1 the valve F will drop back from its seat to allow the flow of the liquid or gas inthe directions indicated.

It will be understood that my improved valve mechanism can be applied to water and steam connections between boilers, and by reason of its peculiar construction should one boiler. burst steam and water will be prevented from leaving the other boilers of battery, and in water, gas, and oil-pipe mains the said valve will readily shut off the supply should there be a break in said pipes or mains.

This invention is especially adapted to hydrocarbon lighting systems to automatically cut off supply in case of breaking of pipes.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, isw

l. An automatic valve mechanism of the character described, comprising a casing having a valve-chamber, a valve-inlet feeding into the bottom of said chamber, a detachable cap having a receiving-socket normally in communication with the valve-chamber and having a valve-outlet, a valve comprising a body of substantially the diameter of the valvechamber in which it is held for free vertical movement, a valve-cap on the upper end of the body, said body having passages for connecting the bottom of the chamber with the receiving-socket in the casing-cap, said valvecap having its face arranged to engage the valve-seat of the lower end of the receivingsocket, as set forth.

2. An automatic valve mechanism of the character described, comprising a casing including a body having a valve-chamber open at the top, an intake-opening in the lower end of said chamber, a cap detachably tting on the top of said chamber having a receivingpocket directly over the said chamber, said pocket being provided at the lower end with a valve-seat, an olftake-port, and a pressuregage port communicating with the said pocket,

a valve vertically movable within the chamber under the varying fiow of the uid or gas thereagainst, said valve including a cap at the upper end Shaped to engage the receivpocket having a valve-seat at its lower edge,

and a valve vertically movable under the varying fluid and gas iiow in the valve-chamber, said valve including a body portion and a cap mounted on the upper end of the body portion and having a diameter less than that of the said body portion, the said valve-body and the cap having communicating passages joining the upper and lower parts of the valvechamber, as set forth.

4. An automatic valve mechanism comprising a casing having a valve-chamber, a valvecontrolled inlet feeding into the bottom of said chamber, a valve-controlled outlet communieating with the top of said chamber, a valveseat near the top of said chamber below the valve controlled outlet, an automaticallyshifting valve within said valve-chamber for cooperating with said last-named valve-seat, said automatically-shifting valve having fluidpassages passing therethrough, and means carried by said automatically-shifting valve for varying the capacity of said fluid-passages, and asupplemental outlet communicating with the valve-chamber near the top for connecting with a pressure-gage, all being arranged substantially as shown and described.

THOMAS LEE STEWART.

Witnesses:

CHAS. A. BURCKHARDT, A. T. LEWIS. 

